Cylinder cock



- J. G. BLUNT CYLINDER COCK Filed March 3, 1925 2 Sheets-Sheet 1 Patented May 10, 1927.

UNITED STATES JAMES e. BLUNT, oFsonn vEcraDY, NEW YORK.

CYLINDER COCK.

Application filed March 13, 1925. Serial No. 15,400.

This inventionrelates to a combinedcylindcr cock and automatic Water relief valve for locomotives.

One of vthe olojects of my vinvention is to provide in a device of such character a valve which Will open automatically when the 10 comotive is at rest, to drain oil? the Water of condensation from the locomotive cylinder and which may be opened at other times, by manually controlled means, for the same purpose.

Another object is to provide in such adevice a separate valve Which is adapted to'be opened automatically by an excess of pressure in the'locomotive cylinder, caused, for example, by an accumulation of water therein, and Which, upon being opened, re

lieves the pressure and permits the accumu-- lated Water to drain oil.

A further object of my invention is to combine these two valves in a .singlehousing, so that While the outlet openings which they control are separate, a single inlet, orcominunication to the cylinder, may be employed for both.

Another object of my invention isso to dispose the valve cont-rolled outlets to Which l'liave referred that theescape of moisture and steam throughthem Will be muffled.

Preferably, a so, I'pr-ovide means which may be used, when desired, for securing the Water-relief-valve in closed position, so. that it will not operate, such means, however, not affecting the cylinder-cock-valve in any way. i

Other objects of myiuvention will appear more fully hereinafter.

In the drawings, :1? ig. lis alongitudinal crosssection/oi-my improved device, both the cylinderrcoclr-zvalve and: the Water-reliefvalvebeing closed; Fig. dis a similar view, showing the cylinder-cock-valve in'athe open position which it assumes when the locomotive is at rest; Fig, :3 shows the iwaterrehefvalve, {as it is opened automatically-by an excess of pressure in the;locomotive:cylinder; and-Fig. l is a fragmentary-viewshowing the endecover of the casing reversed 50 a it holds the Water-relief-valve positively closed. k r

The housingl is preterably of a generally cylindrical atorin. Within it is a 011 5 1 2 which; communicates with the locom tive the differential piston 6, 8, 9, the area of the end-9 being greater thanthatlof the end :6. A spring =10 normally tends to push this pistonto the left to open the valve 6.. But when the locomotive "is in operation, with steam iniits cylinders, steam pressure is communicated to the chamber 2 through the-in let This pressure, acting on the differein tial piston, holds it inthe position shown in ig.'1,.ag.ainst the action of the spring-1 0. 'lVhenthe "locomotive comes to rest the steam pressure in itscylinder is reduced, and, as' a result, the spring 10 pushes the dif-. terentialpiston to the lettto open the valve 6, and. permit the water of condensation to drainuofi". When steam is again admittedto the 'loco-motive cylinder,to setv the locomotive in motion, pressure is again built up in chamber 2 sufficient to move the differential piston to the right to close the val veq6.

in addition to this automatic arrangement for operating the valve 6, I provide manual-- ly controlled means for openingthe valve 6, when desired, While there is steam pressurein the cylinder and inzthe chamber 2. These means include the auxiliary piston 11 against which one end of the spring .10 seats. Fluid under pressure, as for example, air from the air-brake supply, may be admitted behind this auxiliary piston through the'inlet 1'2, when desired,-by means of a control (not shovvnllocated in. the cab. The efiect isto push the auxiliary pistoirll to the left, compressingthe spring 10 and causing it to overcome the difierential action ofthe steam pressure inthe chamber 2 and to open nltmoreme ts ottheiva1ve,6-and o the valve 7 are cushioned by the dash pot effect of the chamber 13 which is formed in the valve 7 and within which the valve 6 is slidably mounted. This chamber, which is provided with leakports 13 operates alternately as a compression or vacuum chamher, as will be readily understood.

The valve 7, as shown, is concentric with the valve 6, and, in fact, forms the casing or cylinder 13 in which that valve operates. In Fig. l the valve 7 is closed against its outlet seat 5, and held closed by the spring 15 against the steam pressure within the chamber 2. In this connection. it should be noted that in my construction, so far as the valve 7 is concerned, this steam pressure acts only upon the relatively small annular surface T and not upon a complete circular surface the size of the outlet 5. Thereforethe spring 15 for overcoming this pressure can be very much lighter than is required in the case of a water-relief-valve which is not combined with a cylinder-cock-valve in the manner described.

As stated, the spring 15 resists the normal steam pressure in the locomotive cylinder and chamber 2. But when there is an excess of pressure due to an accumulation of water in the cylinder, the spring 15 is overcome and the valve 7 is opened, relieving the pressure and draining off the water through the outlet 5. IVhen the pressure has been relieved sufficiently, the spring 15 again closes the valve.

The compression of the spring 15 may be adjusted in any suitable way, as for example, by adding or removing washers 16. In case the spring 15 should break, or for any other reason it were desired to hold the valve 7 closed positively against automatic operation, that can be accomplished by reversing the left hand end plate 17, as shown in Fig. 4:.

l l hichever of the valves 6, 7, is opened, the escaping steam and water does not pass directly to the atmosphere but goes first into mufliing chamber 18 from which it escapes through the numerous small ports 18. The effect of this is to reduce materially the noise incident to the operation of the device.

From the above description it will be apparent that I have produced a simple and efficient cylinder cock and relief valve, all of the parts of which are conveniently assembled within a single housing, but in such a way that the two valves operate independently of each other, though communicating with the locomotive cylinder through a single inlet.

The terms and expressions which I have employed are used as terms of description and not of limitation, and I have no intention, in the use of such terms and expressions, of excluding any equivalent of the features shown and described, or portions thereof, but recognize that various modifications are possible within the scope of the invention claimed.

What I claim is:

1. In a cylinder cock structure for steam locomotives, an elongated casing having a steam inlet port in its side wall, a differential piston device mounted in the casing for movement longitudinally thereof, hollow cylindrical seats for the pistons of said differential piston device, the seat for the smaller piston being provided in its side wall with a discharge port adapted to be covered and uncovered by the movement of the piston, said steam inlet port in the easing being located between the pistons whereby steam pressure will act on the larger piston to move the smaller piston to port closing position, and spring means acting against the outer end of the larger piston to move the smaller piston to discharge port uncovering position upon the fall of steam pressure between the pistons.

2. In a cylinder cock structure for steam locomotives, an elongated casing having a steam inlet port in its side wall, a differential piston device mounted in the casing for movement longitudinally thereof, hollow cylindrical seats for the pistons of said differential piston device, the seat for the smaller piston being provided with a discharge port adapted to be covered and uncovered by the movement of the smaller piston, said steam inlet port in the casing being located between the pistons whereby steam pressure will act on the larger piston to move the smaller piston to discharge port closing position, spring means against the outer end of the larger piston to move the smaller piston to discharge port uncovering position, and manually controlled pneumatic means arranged to act on the differential piston to move the smaller piston to discharge port uncovering position.

3. In a cylinder cock structure for steam locomotives, an elongated casing having a steam inlet port in its side wall, a dilferential piston device mounted in the casing for movement longitudinally thereof, hollow cylindrical seats for the pistons of said differential piston device, the seat for the smaller piston being provided with discharge ports adapted to be covered and uncovered by the movement of the piston, said steam inlet port in the casing being located between the pistons whereby steam pressure will act on the larger piston to move the smaller piston to discharge port closing position, spring means act-ing against the outer end of the larger piston to move the smaller piston to discharge port uncovering position upon the fall of pressure between the pistons, and a mufliing chamber so arranged with relation acting to the discharge ports that discharging fluid passes therethrough whereby to mutfie the noise of discharge. a

4. In a cylinder cock structure for steam locomotives, an elongated casing having a steam inlet port in its side wall, a diflerential piston device mounted in the casing for movement longitudinally thereof, hollow cylindrical seats for the pistons of said differential piston device, the seat for the smaller piston being provided in its side wall with a discharge port adapted to be covered and uncovered by the-movement of the smaller piston, said steam inlet port in the casing bein located between the pistons whereby steam pressure will act on the larger piston to move the smaller piston to port closing position, spring means acting against the outer end of the larger piston to move the smaller piston to discharge port uncovering position upon the fall of steam pressure between the pistons, said seat for the smaller piston serving also as an annular valve member, a seat for the annular valve member adapted to be engaged by the inner end of the annular valve, and spring means engaging the annular valve member and tending to hold the same against its seat, a portion of the end of the annular valve being exposed to pressure whereby excessive pressure between the pistons will move the annular valve member from its seat.

5. In a cylinder cock structure for steam locomotives, an elongated casing having a steam inlet port in its side wall, a differential piston device mounted in the casing for movement longitudinally thereof, hollow cylindrical seats for the pistons of said differential piston device, the seat for the smaller piston being provided with a discharge port adapted to be covered and uncovered by the movement of the smaller piston, said steam inlet port in the casing being located between the pistons whereby steam pressure will act upon the larger piston to move the smaller piston to discharge port closing position, spring means acting against the outer end of the larger piston to move the smaller piston to discharge portuncovering position, manually controlled pneumatic means arranged to act on the differential piston to move the smaller piston to discharge port uncovering position, said cylindrical seat for the smaller piston serving also as an annular valve member, a seat for the annular valve member adapted to be engaged by the inner end of the annular valve member, and spring means engaging the annular valve member and tending to hold the same against the seat, a portion of the end of the annular valve member being exposed to pressure whereby excessive pressure between the pistons will move the annular valve member i'rom its seat.

6. In a cylinder cock structure for steam locomotives, an elongated casing having a steam inlet port in its sidewall, a differential piston device mounted in the casing for movement longitudinally thereof, hollow cylindrical seats for the pistons of said dif ferential piston device, a seat for the smaller piston being provided with a discharge port adapted to be covered and uncovered by the movement of the smaller piston, said steam inlet port in the casing being located between the pistons whereby steam pressure will act upon the larger piston to move the smaller piston to discharge port closing position, spring means acting against the outer end of the larger piston to move the smaller piston to discharge port uncovering position, manually controlled pneumatic means arranged to act on the differential piston to move the smaller piston to discharge port uncovering position, said seat for the smaller piston serving alsO as an annular valve member, an annular seat for the annular valve member adapted to be engaged by the inner end ofthe annular valve member, a radially extending flange on the annular valve member, spring means engaging the flange and tending to hold the annular valve membei against its seat, a portion of the inner end of the annular valve member being exposed to pressure whereby excessive pressure be tween the pistons will move the annular valve member from its seat, and a muflling chamber so arranged with relation to the discharge port that discharging fluid passes therethrough whereby to muflie the noise of discharge. I

JAMES G. BLUNT. 

